oj.uz

Submission #885161

# Submission time Handle Problem Language Result Execution time Memory
885161 2023-12-09T05:34:01 Z 12345678 Pipes (BOI13_pipes) C++17
98.7037 / 100
 1000 ms 37392 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=5e5+5;
int n, m, h[nx], u, v, sz, res[nx], vs[nx], cy[nx], pa[nx], pidx[nx], cnt, lst;
vector<pair<int, int>> d[nx], c;

void dfs(int u, int p, int idx)
{
    vs[u]=1; pa[u]=p; pidx[u]=idx;
    for (auto [v, id]:d[u]) 
    {
        if (v==p||cy[v]) continue;
        if (!vs[v]) dfs(v, u, id);
        else
        {
            int tmp=u;
            while (tmp!=v) cy[tmp]=1, c.push_back({tmp, pidx[tmp]}), tmp=pa[tmp], cnt++;
            cy[v]=1; cnt++; c.push_back({v, id});
        }
    }
    if (idx==-1||m==n) return;
    res[idx]=2*h[u];
    h[p]-=h[u];
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) cin>>h[i];
    for (int i=1; i<=m; i++) cin>>u>>v, d[u].push_back({v, i}), d[v].push_back({u, i});
    if (m>n) {cout<<0; return 0;}
    dfs(1, 1, -1);
    if (cnt%2==0&&cnt!=0) {cout<<0; return 0;}
    if (m<n) for (int i=1; i<n; i++) cout<<res[i]<<'\n';
    else
    {
        m=n-1;
        for (int i=1; i<=n; i++) vs[i]=0;
        for (auto [x, y]:c) dfs(x, x, -1);
        int l=-1e9, r=1e9;
        while (l<=r)
        {
            vector<int> t(c.size());
            int md=(l+r+1)/2;
            //cout<<"here "<<l<<' '<<r<<' '<<md<<'\n';
            lst=md;
            t[0]+=md;
            t[c.size()-1]+=md;
            res[c[c.size()-1].second]=2*md;
            for (int i=1; i<c.size(); i++) t[i]+=(h[c[i-1].first]-t[i-1]), res[c[i-1].second]=2*(h[c[i-1].first]-t[i-1]);
            if (t[c.size()-1]==h[c[c.size()-1].first]) break;
            if (t[c.size()-1]>=h[c[c.size()-1].first]) r=md-1;
            else l=md+1;
        }
        //for (int i=1; i<=n; i++) if (cy[i]) cout<<i<<' '<<h[i]<<'\n';
        for (int i=1; i<=m+1; i++) cout<<res[i]<<'\n';
    }
}

/*
4 4
2 0 2 2
1 2
1 3
2 3
3 4
*/

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:55:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |             for (int i=1; i<c.size(); i++) t[i]+=(h[c[i-1].first]-t[i-1]), res[c[i-1].second]=2*(h[c[i-1].first]-t[i-1]);
      |                           ~^~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 21084 KB Output is correct
2 Correct 4 ms 21084 KB Output is correct
3 Correct 5 ms 21084 KB Output is correct
4 Correct 52 ms 25132 KB Output is correct
5 Correct 4 ms 21080 KB Output is correct
6 Correct 4 ms 21084 KB Output is correct
7 Correct 4 ms 21084 KB Output is correct
8 Correct 4 ms 21084 KB Output is correct
9 Correct 4 ms 21084 KB Output is correct
10 Correct 5 ms 21080 KB Output is correct
11 Correct 5 ms 21084 KB Output is correct
12 Correct 5 ms 21084 KB Output is correct
13 Correct 33 ms 24224 KB Output is correct
14 Correct 50 ms 25168 KB Output is correct
15 Correct 44 ms 25224 KB Output is correct
16 Correct 36 ms 24656 KB Output is correct
17 Correct 45 ms 25168 KB Output is correct
18 Correct 40 ms 25176 KB Output is correct
19 Correct 49 ms 30804 KB Output is correct
20 Correct 4 ms 21084 KB Output is correct
21 Correct 5 ms 21084 KB Output is correct
22 Correct 59 ms 25136 KB Output is correct
23 Correct 46 ms 24352 KB Output is correct
24 Correct 40 ms 25172 KB Output is correct
25 Correct 33 ms 24412 KB Output is correct

Subtask #2
68.7037037037 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 21084 KB Output is correct
2 Correct 5 ms 21340 KB Output is correct
3 Correct 38 ms 28892 KB Output is correct
4 Correct 32 ms 18268 KB Output is correct
5 Correct 29 ms 18472 KB Output is correct
6 Correct 107 ms 28752 KB Output is correct
7 Correct 4 ms 21080 KB Output is correct
8 Correct 4 ms 21084 KB Output is correct
9 Correct 4 ms 19036 KB Output is correct
10 Correct 3 ms 14940 KB Output is correct
11 Correct 3 ms 14936 KB Output is correct
12 Correct 3 ms 14940 KB Output is correct
13 Correct 3 ms 14936 KB Output is correct
14 Execution timed out 1056 ms 21084 KB Time limit exceeded
15 Correct 4 ms 21096 KB Output is correct
16 Correct 4 ms 21260 KB Output is correct
17 Correct 4 ms 19036 KB Output is correct
18 Correct 3 ms 14940 KB Output is correct
19 Correct 3 ms 14936 KB Output is correct
20 Correct 3 ms 14940 KB Output is correct
21 Correct 3 ms 14940 KB Output is correct
22 Correct 4 ms 21080 KB Output is correct
23 Correct 44 ms 31432 KB Output is correct
24 Correct 53 ms 32612 KB Output is correct
25 Correct 52 ms 28884 KB Output is correct
26 Correct 31 ms 18260 KB Output is correct
27 Correct 29 ms 18000 KB Output is correct
28 Correct 33 ms 19024 KB Output is correct
29 Correct 98 ms 26024 KB Output is correct
30 Correct 57 ms 36296 KB Output is correct
31 Correct 66 ms 37060 KB Output is correct
32 Correct 53 ms 27912 KB Output is correct
33 Correct 40 ms 30416 KB Output is correct
34 Correct 32 ms 18004 KB Output is correct
35 Correct 32 ms 18268 KB Output is correct
36 Correct 31 ms 18524 KB Output is correct
37 Correct 104 ms 28752 KB Output is correct
38 Correct 62 ms 34944 KB Output is correct
39 Correct 45 ms 26964 KB Output is correct
40 Correct 59 ms 31824 KB Output is correct
41 Correct 44 ms 34772 KB Output is correct
42 Correct 29 ms 18012 KB Output is correct
43 Correct 30 ms 18008 KB Output is correct
44 Correct 31 ms 18296 KB Output is correct
45 Correct 86 ms 27216 KB Output is correct
46 Correct 74 ms 37392 KB Output is correct
47 Correct 59 ms 32180 KB Output is correct
48 Correct 60 ms 36540 KB Output is correct
49 Correct 34 ms 24924 KB Output is correct
50 Correct 31 ms 18260 KB Output is correct
51 Correct 31 ms 18268 KB Output is correct
52 Correct 31 ms 18012 KB Output is correct
53 Correct 93 ms 26888 KB Output is correct
54 Correct 59 ms 33952 KB Output is correct